交流线路避雷线融冰故障电磁暂态分析与间接式行波故障定位方法  

Electromagnetic transients analysis and indirect traveling wave fault location forground wires of AC transmission line amid de-icing

作　　者：曹璞璘[1] 黄美琴 王云龙 陈诺 束洪春[1] 杨博 CAO Pulin;HUANG Meiqin;WANG Yunlong;CHEN Nuo;SHU Hongchun;YANG Bo(Kunming University of Science and Technology,Kunming 650500,China;Kunming Electric Power Bureau,China Southern Power Grid EHV Transmission Company,Kunming 650000,China)

机构地区：[1]昆明理工大学,云南昆明650500 [2]中国南方电网有限责任公司超高压输电公司昆明局,云南昆明650000

出　　处：《电力系统保护与控制》2023年第10期11-21,共11页Power System Protection and Control

基　　金：国家自然科学基金项目资助(52167012);云南省基础研究计划项目资助(202001AT070096)。

摘　　要：由于避雷线通常逐塔接地,因此往往对其进行消去处理以降低参数矩阵阶数,但是在避雷线融冰过程中其与沿线杆塔绝缘,会受到线路电磁耦合影响。在研究避雷线对地绝缘条件下多导体传输系统电磁暂态耦合的基础上,推导双回非对称相数多导体传输系统的解耦方式,提出避雷线对地绝缘情况下的相模变换矩阵,并指出避雷线对地绝缘会造成由三相线路所构成模量中出现“零模提速”现象。在此基础上,考虑电容式电压互感器暂态传变特性影响,提出一种利用三相交流线路行波测距装置对避雷线直流融冰期间发生的故障进行间接式双端不同步故障测距的方法,并通过渐进峭度曲线剔除现场实测信号中的电磁噪声,实现波头准确辨识,大量仿真表明该方法可行有效。The ground wire is usually eliminated to reduce the order of the parameter matrix because of its direct connection to towers.However,the tower must be insulated from ground wires in the process of de-icing.In this paper,on the basis of analysis of multi-conductor system electromagnetic transient coupling in the case of insulated ground wires,the decoupling method of double-circuit electromagnetic coupling with asymmetric phases is deduced.A phase-mode transform matrix for an insulated ground wire is obtained.In addition,the insulated ground wire causing‘speed increase in zero mode’with the traditional decoupling matrix is pointed out.Based on the analysis,in consideration of the transient frequency response of capacitive voltage transformers,an indirect fault location scheme using fault locators in three-phase transmission lines to locate ground wire faults is proposed for a double-terminal fault location without synchronization.The progressive kurtosis curve is applied to remove the electromagnetic noise of real measured signals and the wavefronts are identified accurately.A large quantity of simulations is carried out to verify the effectiveness of the proposed fault location scheme.

关 键 词：避雷线 直流融冰 相模变换 峭度 故障测距 行波 

分 类 号：TM752[电气工程—电力系统及自动化]